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I have had similar problems. I bought my car used and things went well for a while but I began having trouble with the battery dying for no reason. Then, i punched the gas one day and a light came on that said I had electrical problems. The car still ran but it was not on full power. I cut off the engine and restarted and it was fine. Then the thing with the locks, windows, cd player etc started. I had the battery checked and the previous owner had put in an insufficient battery. It was too small for the car. I replaced it ($197) two weeks ago and no more problems.